M16 remark code

Remittance advice remark code M16. Remark codes add detail to the reason code on the same claim line.

Alert: see payer bulletins or website

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What M16 means

An informational alert telling you to look at the payer's published policy material for more detail on this decision.

This is an alert, not a reason for nonpayment by itself. The payer is pointing you to its newsletters, bulletins or website, where the policy behind the adjustment is explained.

Read it with the reason code on the same line, which shows what actually happened to the money.

Common causes

• The payer applied a coverage or payment policy that is explained in its provider publications.
• A recent policy change affected how this service is processed.
• The payer wants to direct you to guidance rather than spell it out on the remittance.

What to do next

1. Read the reason code on the same line to see what actually happened to the payment.
2. Look up the payer's current policy or bulletin for the service on its provider website.
3. Share the policy change with coders and front desk staff if it will affect future claims.

Related codes

• M84 (remark code) Use code sets in effect for the date
• MA01 (remark code) Alert: how to appeal this decision